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DEC (Display Energy Certificates) 

Display Energy Certificates (DECs) show the actual energy usage of a building, the Operational Rating, and help the public see the energy efficiency of a building. This is based on the energy consumption of the building as recorded by gas, electricity and other meters. The DEC should be clearly displayed at all times and clearly visible to the public. A DEC is always accompanied by an Advisory Report that lists cost effective measures to improve the energy rating of the building. 

Display Energy Certificates are only required for buildings with a total useful floor area over 1,000m 2 that are occupied by a public authority and institution providing a public service to a large number of persons and therefore visited by those persons.  

·         Display Energy Certificates will have a validity of one year

·         The accompanying Advisory Report is valid for 7 years

·         Display Energy Certificates come into effect on October 2008


The requirement for Display Energy Certificates came into effect on 1 October 2008. If you are an occupier of a building requiring a DEC you need to display the certificate showing an Operational Rating in a prominent place clearly visible to the public. A valid advisory report is also needed. If you are a new occupier, or have been in occupation for less than 15 months by 1 October 2008, you may not have 12 months of meter readings available that are required for an Operational Rating.  

The legislation makes provisions for calculation over the period of occupation in these cases. DECs must be renewed every 12 months. If you are in possession of an Energy Performance Certificate - which are currently being introduced and will be required for the sale, rent or construction of all buildings from October 2008 - you will have an Asset Rating for the building. This must also be displayed on the DEC.  

Our In house team of government approved and accredited specialists are available to undertake DEC survey and would only be glad to assist should you have any questions.

Contact our team on    Tel: 01908 850109         or        Email your requirements to  This e-mail address is being protected from spambots. You need JavaScript enabled to view it